wasn't Justine Greening (Con. Putney) a transport minister at one time?
Geening was Secretary of State for Transport (the post now held by Patrick McLoughlin).
Robert Goodwill is the Minister of State for Transport, reporting to the Secretary of State, the post previously held by Simon Burns and, before that, by Theresa Villiers. The post, often wrongly described as "Aviation Minister", also includes responsibility for rail (including HS2) and London Transport.